I made a video some times ago.https://www.youtube.com/watch?v=mcoBxztdA1sFrom 0:40sec. you can see some measurements with Sylomer.
Sorbothane is not long-therm stable.
Sorbothane is not long-therm stable.
Turntable isolation
My last turntable was a VPI HW19 MK4 .... with the springs. It's isolation from footfalls was terrible on wood framed floor. Are the modern tables with sorbothane feet better at isolating?